.dropload-up,
.dropload-down {
  position: relative;
  height: 0;
  overflow: hidden;
  font-size: 15px;
  /* 开启硬件加速 */
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

.dropload-down {
  height: 25px;
}

.dropload-refresh,
.dropload-update,
.dropload-load,
.dropload-noData {
  height: 25px;
  line-height: 25px;
  text-align: center;
}

.dropload-load .loading {
  display: inline-block;
  height: 20px;
  width: 20px;
  margin: 6px;
  vertical-align: middle;
  border: 2px solid #666;
  border-bottom-color: transparent;
  border-radius: 100%;
  -webkit-animation: rotate 0.75s linear infinite;
  animation: rotate 0.75s linear infinite;
}

@-webkit-keyframes rotate {
  0% {
    -webkit-transform: rotate(0deg);
  }

  50% {
    -webkit-transform: rotate(180deg);
  }

  100% {
    -webkit-transform: rotate(360deg);
  }
}

@keyframes rotate {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }

  50% {
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
  }

  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}